A mixed strain rate and energy based fatigue criterion for short fiber reinforced thermoplastics

•A large fatigue data base was produced to fully address orientation and loading ratio effects.•The evolution of a wide number of mechanical quantities was monitored.•A strain rate fatigue criteria is proposed for uniaxial and positive loading ratio fatigue tests.•This criteria is able to unify all...

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Bibliographic Details
Published in:International journal of fatigue 2019-10, Vol.127, p.131-143
Main Authors: Raphael, I., Saintier, N., Rolland, H., Robert, G., Laiarinandrasana, L.
Format: Article
Language:English
Subjects:
Anelasticity
Anisotropy
Cyclic loads
Engineering Sciences
Fatigue criterion
Fatigue life
Fatigue tests
Fiber reinforced polymers
Materials fatigue
Mean stress effect
Mechanical properties
Parameter estimation
Short fiber composite
Short fibers
Strain rate
Thermoplastic
Thermoplastic resins
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Summary:•A large fatigue data base was produced to fully address orientation and loading ratio effects.•The evolution of a wide number of mechanical quantities was monitored.•A strain rate fatigue criteria is proposed for uniaxial and positive loading ratio fatigue tests.•This criteria is able to unify all the fatigue data with a single mechanical parameter.•In order to consider negative loading ratio tests an additional strain energy parameter is used.•The efficiency of the proposed criteria is unique considering the few number of parameters. Multiple parameters influence the durability of reinforced thermoplastics under fatigue loading. Having models unifying as many of these parameters, while providing an accurate estimation of the fatigue lifetime, is thus key. This investigation on the evolution of multiple mechanical parameters under cyclic loading, and based on a large experimental database (more than 200 uniaxial fatigue tests over a wide range of load ratios), two cyclic strain-rate based criteria are proposed. The second is more elaborated, introducing anelastic energy, to better account for mean stress effect and unify fatigue life predictions within scatter bands of factor two.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2019.06.003